Which of the following should be the FIRST sentence after the rearrangement?

Rearrange the given five sentences A, B, C, D and E in a proper sequence so as to form a meaningful paragraph and then answer the given questions: (A)Recognizing the first principle, a minimum living standard has been institutionalized in many richer countries. (B) First- the provision of a minimum living standard for all, adjusted to a country’s changing circumstances. (C) Countries can select to adopt different goals for guiding their national development projects. Three principles, however, need to be protected, which are simultaneously valued ends and necessary devices: (D) Third- accessible forums for expressing governance concerns and overseeing quality standards in service delivery (E) Second- an equal chance of upward mobility for everyone’s son or daughter.